Spring-back chair.



No; 758,133. PATBNTBD APR.y 26, 1904.-

J.` GILS'ON. SPRING BACK CHAIR. urLIcATIoN Hum un. 2o.|19o4.

No MODEL.

Patented April 26, 1904.

'JoHN'eiLson or Pour wA'sniNeroN, wrsooNsIN,.Ass1eNoE To eiLsoN MANUFACTURING COMPANY, OF` PORT WASHINGTON, VISOONSIN.

' SPRING-BAQK CHAIR.

SPECIFICATION forming part of Letters Patent No. 758,133, datedApril 26, 1904.

Applicants and February zo, 1904..- serai No. 194,475. (No man 4 T 0 al?, whom, t muy concern:

Be it known that I, JOHN GILSON, a citizen of the United States, and a resident of Port Washington, in the county of Ozaukee and State of Wisconsin, have invented certain new and useful Improvements in Spring-Back Chairs; and I do hereby declare that the following is a full, clear, and exact description thereof.

4My invention consists in certain peculiarities of construction and combination of parts hereinafter particularly set forth, with reference to the accompanying drawings, and subsequently claimed, the object of said invention being to simplify and cheapen the manufacture of spring-back chairs, as Well as to provide an antibinding noiseless coupling for the back and seat of such a chair.

Figure l of the drawings represents a vertical section view of a chair-seat spider and a spring-back coupling in 'accordance with my invention applied in connection with an arm of said spider; Fig. 2, a plan View of `what is shown in Fig. l, a recurved yielding strap constituting part of the coupling being partly broken away; Fig. 3, a transverse sectional View indicated by line 3 3 in Fig. l, and Fig. 4 a perspective view'of a plate constituting part of said coupling.

Referring by letter to the drawings, A indicates the rear arm of what is ordinarily a chair-seat spider, and B an adjusting-screw made fast at its upper end in the spider. Said arrn of the spider is shown made partly open eral lugs LZ of said spider-arm serve as forward supports for the strap O, andrcountersunk in the solid portion of the arm is the partly-squared head of a bolt D, that extends through the upper stretch of said strap and a plate E, a bur e of this plate being engaged with an aperture in the under stretch of the strap. This under stretch of the strap is flanked by upwardly-extending lugs f' of the plate E and caught under a raised bar g of said plate.' The bar connects a pair of rearl wardly-exteuding side lugs la. of the plate-E,

and forward depending curved fingers c' of said platebear upon the depending bend c of the aforesaid strap. Each lug i of the plate E is bored longitudinally thereof to receive the lower horizontal end of a suitably-bent spring-rod F, that constitutes part of achairback, and a set-screw y' may be employed in connection with said lug to bind said rod in engagement therewith.

Surrounding the bolt D, between the plate Eand awasher le, is a spiral spring Gr ofsuitable strength, and the tension of this spring is regulated by adjustment of a nut H, run on said bolt, against said washer.

In practice theyield of the chair-back is against resistance of its rods F and the spring G, the recurved yielding strap C serving to prevent binding and noise in the joint between said chair-back and seat-Spider or a seat attachment virtually the same as the rear arm of said spider.

Having thus described my invention, what I claim as new, and desire to secure by Letters a plate-opposing spring, and a nut adjustable on the bolt to regulate tension of the spring. 2. A chair -seat attachment, a recurved spring-metal strap supported by the attachment, the bend of the strap being partly below the under stretch of same, a chair-backsupporting plate hung on the under stretch of 'the' strap and extended parallel to the bend aforesaid, a bolt extending through said ate tachment, strap and plate; a plate-opposing spring, and a nut adjustable on the bolt to regulate tension of the spring.

3. A chair-seat attachment, a recurved spring-metal strap supported by the attachment, the bend of the strap being` partly below the under stretch of same, a chair-backsupporting plate hung in connection with said under stretch of the strap and extended parallel to the bend aforesaid, strap-opposing lugs on the plate, a bolt extending through said attachment, strap and plate; aplate-opposing spring, and a nut adjustable on the bolt to regulate tension of the spring.

4. A chair seat attachment, a recurved spring-metal strap supported by the attachment, the bend of the strap being partly beloW the under stretch of same, a plate having rearwardly-extended and bored side lugs connected by a bar under which the lower end of said strap is caught, said plate being extended parallel to the bend aforesaid, a bolt extending through said attachment, strap and plate; a plate-opposing spring, and a nut adjustable on the bolt to regulate tension of the spring.

5. A chair-seat attachment having opposite inner lugs, a recurved spring-metal strap supported on said lugs, a chair-back-supporting plate hung on said under stretch of the strap,

a bolt extending through said attachment, strap and plate; a plate-opposing spring, and anut `being partly/below the under stretch of same; a

plate having rearwardly-extending and bored side lugs connected by a bar over the other end of said strap, Said plate being extended parallel to the bend aforesaid; a bolt extending through said spider-arm,4 strap and plate; a plate-opposingspring, and a nut adjustable on the bolt to regulate tension of the spring.

In testimony that I claim the foregoing I vhave hereunto set my hand, at Port Washington, in the county of Ozaukee and State of 'Wisconsin, in the presence of two Witnesses.

JOHN GILSON.

Witnesses:

HARRY W. BoLENs, EDWARD f BARELMAN. 

